<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>flat 与 flatMap</title>
  </head>
  <body>
    <script>
      //flat 平
      //将多维数组转化为低位数组
      //   const arr = [1, 2, 3, 4, [5, 6]];
      //   const arr = [1, 2, 3, 4, [5, 6, [7, 8, 9]]];
      //参数为深度 是一个数字
      //   console.log(arr.flat(2));

      //flatMap
      const arr = [1, 2, 3, 4];
      const result = arr.flatMap((item) => [item * 10]);
      console.log(result);
    </script>
  </body>
</html>
